Re: [xsl] Question about keys and cross-referencing (was predicate)

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Chris,

At 03:33 PM 5/5/2003, you wrote:
> So I've got an input structure like this:
>
> <e eid="e0001"><hg><hw>keyword</hw></hg><se1>...</se1></e>
> ...
> <e eid="e1234"><hg><hw>different_keyword</hw></hg><se1>... <xg>See also 
> <xr>keyword</xr></xg>...</se1></e>
>
> where the <xr> element "keyword" needs to link to the <e> element where 
> the <hw> is "keyword".
>
> I'm thinking that I can set up a key like
>
> <xsl:key name="headwords" match="hw" use="ancestor::e/@eid" />
>
> and then reference it in my xr template like
>
> <xsl:attribute name="href"><xsl:text>#</xsl:text><xsl:apply-templates 
> select="key('headwords',ancestor::e/@eid)" /></xsl:attribute>
>
> Does that sound right?

I'd say -- not quite. "ancestor::e/@eid" for the current node when the 
template is matched, where this attribute is generated, will be e1234, not 
e0001. You want to refer to e0001.

You could define your key as

<xsl:key name="e-by-hw" match="e" use="hg/hw"/>

Then

<xsl:apply-templates select="key('e-by-hw',.)"/> to select the target "e" 
element refered to by its headword elsewhere.

> Sometimes I've got several headwords that are identical except for the 
> homograph numbers, like so:
>
> <e eid="e0003"><hg><hw>keyword</hw><hom>1</hom></hg><se1>...</se1></e>
> <e eid="e0004"><hg><hw>keyword</hw><hom>2</hom></hg><se1>...</se1></e>
> <e eid="e0005"><hg><hw>keyword</hw><hom>3</hom></hg><se1>...</se1></e>
>
> and these are referenced like so:
>
> <e eid="e2345"><hg><hw>different_keyword</hw></hg>... <xg>See also 
> <xr>keyword</xr><hom>1</hom></xg>...</e>
>
> Is there a way to include those homograph numbers in the key and in the 
> cross-reference so that I get the
> correct (I hope unique) link?

Sure, you could define your key as

<xsl:key name="e-by-hw" match="e" use="concat(hg/hw, '-' ,hg/hom)"/>

Then

<xsl:apply-templates select="key('e-by-hw',concat(., '-' ,../hom))"/>

Make sense?

Cheers,
Wendell


======================================================================
Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
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Suite 207                                          Phone: 301/315-9631
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